Colorimetric, Ultra-structural and Elemental Comparison of Dental Enamel Defects

For patients : Inclusion Criteria : 1. Age between 8 and 55 years old 2. Carrier of one of the following 3 quantitative pre-eruptive enamel anomalies : AIH, dental fluorosis or MIH 3. Information and collection of the non-opposition of the adult patient or of the representative(s) of parental authority present for the minors. Criteria for non-inclusion : 1. Pregnant or breastfeeding woman 2. Under guardianship or curators 3. Opposition of the minor patient 4. Presenting pre-eruptive anomalies only on the molars (the spectrophotometer can only take pictures of the anterior dental sector (incisors and canines)). 5. Other types of hypomineralization (post-eruptive, of traumatic or infectious origin, idiopathic). 6. Having undergone radiotherapy or chemotherapy inducing dental and periodontal damage. 7. Having systemic abnormalities (unbalanced diseases), haemochromatosis, porphyria 8. Under medication likely to disturb the coloring of the teeth For witnesses : Inclusion Criteria : 1. Age between 8 and 55 years old 2. Information and collection of the non-opposition of the adult witness or of the representative(s) of parental authority present for the minors. 3. Free of any anomaly of tooth structure, exogenous dyschromia and carious lesions. Criteria for non-inclusion : 1. Pregnant or breastfeeding woman 2. Under guardianship or curators 3. Opposition of the minor witness 4. Carrier of a quantitative pre-eruptive enamel anomaly 5. Polycarpus (preventing the diagnosis of amyl hypomineralization)